DTH Pool allows a DTH to lend their DAO Tokens to a delegate in order to vote in his name without loosing the control of his DAO tokens. Code and README are available in the official DAO github repository.
Advantages are:
DTHs can delegate the vote to any DTHPool controlled by a delegate.
The DTH can undelegate and vote for himself, change the delegate or split at any moment, like in the Liquid democracy model.
Their tokens “almost” never get blocked.
DTH can cold-store his private key and still participating from voting.
Can be used as a “set the vote now and vote in the last moment” helper.